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  <h1 class="topictitle1">ESXi主机的域名无法被备份代理主机识别，备份恢复失败</h1>
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    <h4 class="sectiontitle">现象描述</h4>
    <p>备份或恢复过程中任务失败，从备份代理的日志中可以搜索到如下报错：</p>
    <p>Failed to establish connection with the NetBackup master server. Error: HTTPSConnectionPool(host='xxx.server', port=443): Max retries exceeded with url: /netbackup/security/ping (Caused by NewConnectionError('&lt;urllib3.connection.HTTPSConnection object at 0x7f9e466b0ef0&gt;: Failed to establish a new connection: [Errno -2] Name or service not known',))</p>
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    <h4 class="sectiontitle">可能原因</h4>
    <p>备份恢复过程中，备份代理主机需要与可以访问该磁盘的ESXi主机建立连接，但目标ESXi主机的域名无法被备份代理识别。</p>
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    <h4 class="sectiontitle">处理步骤</h4>
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     <li><span>使用PuTTY工具以<strong id="vmware_gud_0111__zh-cn_topic_0000001792390248_b916917212">root</strong>账户登录代理主机。</span></li>
     <li><span>添加对应域名服务器到<span class="filepath">“/etc/resolv.conf”</span>，或添加目标主机IP与主机名映射到<span class="filepath">“/etc/hosts”</span>。</span></li>
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